Blast-furnace tuyere cap for pulverized coal



R. A. WAGSTAFF. BLAST FURNACE TUYERE CAP FOR PULVEFHZED COAL.

APPLICATION FILED MAR. 15. 1920- Patented May lfi, 1922.

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NVE/VTUR ATTORNEYS w/msssm;

UNlTED srA'rcS OF NEW JERSEY.

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Application filed March 15, 1920.

i T c all whom it or c y concern:

. new and useful Improvements in Blast-Furnace Tuyere Caps :i'orPulverized Coal, of which the following a specification.

The invention relates in general to an im proved form of tuyereconstituting a part of a blastfurnace of the type used in metallurgicaloperations and particularly relates to a closing cap, and associatedparts. for use in connection with the conventional forms of tuyeresusually employed with such furnaces.

In metallurgical furnaces it is at present known to provide one or aplurality of tuyeres for supplying the charge in the fur nace with airand under some conditions to supplement this air with a charge ofcarbonaceous fuel, such as coal. Under some conditions this coal isejected into the furnace through an ejector and forced into the turnacein the form of a cloud under the pro pelling force of a relatively highpressure an.

One of the objects of the invention is to provid a supplemental fuelfeeding tube as a discharge to dispose this discharge tube in positionsin a tuycre so as to utilize-the relatively low pressure air fed throughthe tuyere to supplement the ejector effect upon the .i'uel forced intothe furnace bythe usual ejector.

The invention contemplates, utilization of a closing cap forthe tuyrewhich cap in addition to closing the tuyere constitutes the support forthe supplemental feed tube featured in this disclosure.

Considering the closing cap feature of the disclosure another object ofthe invention is to provide a simple means for securely mounting thefuel feed tube in position in the cap and for mounting the same in. sucha way that .it can be removed without removing any part of the cap.

Another object of the invention is to provide a cap which will. permitan inspectionof the interior of the furnaceor of the tuyere at the pointWhere the fuel supply ing tube is discharging its contents and to permitaccess to the furnace without creatmg an opening which would cause theloss of any material amount of coal dust.

Specification of Letters Patent.

tube from the usual ejector and primarily, the

q otam Patented tiny little .WZlth swarm. 365,829.

Still another object of the invention is to protudea simple design oicover which can be readily assembled or denrounted and in which areadily actuated gate closes the opening through the cap. I t1l1011S0llll" objects and advantages of theinvention will be in part obviousfrom an inspection of the ucminpanyingr drawings and in part will hemore "fully set "l'oi'th in the following: particular description of oneform of mechanism cniln'idvinp my invention. and the invention alsoCOTlFJlSl S in certain new and novel features of arrangement andeoml'iination of parts hereinafter set truth and claimed.

Figure 1 is a View in vertical section of a portion oi? a furnace at oneof the t-uv ercs equipped with a. preferred embodiment of the inventionand taken on the line 2-?! of Figure 2 5 Figure 2 is a view in frontelevatioii ot the cap shown in Figure 1;

l ig'urc 3 is a similar plate:

l 'i uire 1 is a view in side elevation of the device shown in Figureand Figure 5 is a medial vertical sectional view of the rear platesimilar to the showing, of this member in Figure l. but separated bv itsassociated parts. H

In. the drawings there is :z hown a double wall furnace 10 with thewalls spaced apart to provide the usual water jacket space 11.

view of the rear The furnace is provided with an intake port 12extending into the interior 13 of the turnace. The port or opening 12 isoutlined on the outer side of the furnace by the usual tuyre plate 14 towhich is attached a tuvere 15 of conventional form; The tuyere is pro--vided with the usual air conduit 16 for sup lying the furnace with lowpressure air. lhe tuyere is provided as usual with a pair of oppositelydisposed openings 17 and 1.8,

til

the former of which aligns with the opening 12 and constitutes astraight continua t1on thereof leading to the furnace interior.

The outer opening; 18 is closed by means of a built up cap 19particularly constituting the SIlb ]6Ct-IlItlLtQ-i of this disclosure;

9. rear plate demount 20 and a face plate 21 ably fastened one to theother by means 01" The cap is formed mainly of two abutting plates,

screws 22 accessible from the frontside of the cap. The base plate isprovided with a through,

, plate, the exposed securely into set position in the pair oflaterallyextending wings 23 which fit behind lugs 23' projectingforwardly from the front of the tuyere body. The base plate is providedwith two vertically spaced apart holes 24 and 25 and is provided on thelower portionof its front side with an upwardly extending recess forminga gateway 26. A pair of legs 27 constitute downwardly extendingextensions which are provided on their lower ends with inturned flanges28 constituting a supporting ledge for the gate 29 hereinafter moreparticularly described.

The face plate 21 is provided with three vertically disposed openingsextending therelarger in centrically disposed relatively thereto andcoactingwith the opening in the base plate to form a feed pipecontaining opening through the upper portions of the cap.

The base plate is provided with an annular lug receiving recess 31 whichencircles the opening 24 and one portion of which recess is deepened andenlarged diametrically to form an arcuate slot 32. The face plate isalso provided with a dove-tail-shaped opening facing the slotcircumferential extent so as to provide 'a bayonet joint for a lug 34projecting laterally from a locking nut 35. The locking nut is mountedin the opening, 30 with its inner end abutting against the recessedportion of the base plate.

Thevfront side of the lug,3'-i is bevelled as shown at 36 and this bevelside is designed to engage the rear side of the .face so that,- when thelug is rotated from part 33 of the recess 32 circumferentially into thedotted line position shown in Figure 2, the nut- 35 will be wedged nutis provided with an internally threaded bore, A supplemental ejectorpipe 37 has one end screwed into the inner end of the bore and has itsdischarge end 38 positioned within the opening 17 and beyond the conduit16 in the tuyere. Threaded into the outer end of thebore in the nut is adischarge tube 40 from an exteriorly positioned ejector 41. Thisexteriorly positioned ejector is of conventional Y-form having a bell 42connect-ed with a supply of carbonaceous fuel, such as coal, admittedthereto through the flexible tubing 43. The ejector is also providedwith an ejector tube 14 connected at its outer end with a source of highpressure air indicated. symbolically by the flexible tubing 45 and theopposite discharge end 46 of which is arranged axially in the ejee torin position to discharge the cloud of coal through the Edischarge tube40. It is understood that this ejector is of conventional form and theorganization disclosed differs from known forms in the forming of thethe upper opening 30 being slightly diameter than the opening 24, con-'32 but of less cap. The

low pressure air to supplement the ejector feature of the usual form ofejectors which discharge directly into the tuyere or furnace.

The middle opening 47 in the face plate aligns with the opening 25 inthe base plate and coacts therewith to provide a hole clear through thecap and which hole can be utilized either to view the interior of thefurnace at thepoint where the supply of fuel is being ejected thereto bythe discharge nozzle 38, or may be used to introduce a poke tool intothe furnace and for this latter reason this opening will be identifiedhereinafter as a poke hole. The hole is designed to be closed by meansof a gate 29 which is shown to have a bevelled upper portion 4-8 whichbevelled portion has a wedging litin the gateway and is designed to beheld elevated in position closing the poke hole by means of a pin 49insertable through the lowermost hole 50 in the face plate and passedthrough an aligned pin hole 51 in the body of the gate. The gate has itslower portion reduced to form shoulders 52 which engage the flanges 28and support the gate l.

are in the position indicatedqin Figure 1,

the device is in position for. active operation. The air is admittedthrough the conduit;16 and passesinto the interior of the 1 furnacethrough the opening 12 as is usual.

At the same time and with the ejector in active operation, thepulverized coal is ejected forcibly through the ejector tube 4-4- bymeans of the high pressure air admitted through the tube 45 and thisfuel charge is ejected from the nozzle 38. It is further difl'used atthe entrance to the furnace by the action of the low pressure airpassing to the "furnace from the conduit 16. The length of the tube 37is varied so as to bring the discharge nozzle 38 into a. position todischarge the fuel into the tuyere body but in relatively closeproximity to the interior of the furnace and in such a position as totake advantage of the inflowing air from the tuvere.

is made sufficiently large to accommodate a poke tooland such a tool canbe introduced through the hole so as to break up any accumulations inthe opening 12. However, it is to be understood that this poke hole isof small dimension, a hole of about one-inch diameter having been foundto be sufficiently large and but little fuel or from such a small hole.

The gate can be knocked into closed position and the re-insertion of thepin will secure the gate against any accidental falling into an openingposition.

By means of a device of this character it is possible to permit theoperator to look inside the tuyere while the carbonaceous fuel is beingadmitted and thus provide for an accurate control during the entireblow.

The operator can punch open the tuyere without removing any part of thecap and. thus cut down the amount of coal dust which; might otherwiseescape into the at mosphere. The bayonet lock connection providedbetween the locking nut carrying the fuel ejector discharge pipe permitsof a ready disconnection between the coal injector and thetuyererwithout affecting use of the cap as a closure means- Should it bedesired to permanently close the opening for the ejector pipe, it is ofcourse possible to substitute a solid nut for the bored lockin nutdisclosed.

The positioning of the coal discharge nozzle inside of the tuyere andbeyond the down-coming air therein allows this down coming air to havean previously ejected fuel supplied through the external ejector. p

Having thus described my invention, I claim:

1. In a furnace structure, the combinationv of a. furnace provided witha tuyere body 111 f communication with the interior of the fur nace,said body provided with an opening on the side thereof opposite thefurnace, a cap for closing said opening, a feed tube for conducting fuelto the furnace, said tube carried by the cap, extending therethrough andthrough said opening into the interior of the tuyere body, easilyseparable means for securing the tube to the cap and for permitting theready dinnounting of the tube from the cap, said tube being removable asa unit with the cap.

2. In a furnace, the combination of a furnace provided with a tuyerebody having oppositely disposed openings to permit a view into theinterior of the furnace, a cap forclosing the outer of said openings, afuel feeding tube carried by the cap and extending therethrough towardsthe furnace to supply the same with fuel, and said cap provided with ahole for viewing the discharge of the feed tubes from a point exteriorlyof the furnace.

gas can escape ejector effect upon the" *into the interior of the tuyerebody,

3. In a furnace, the combination of a furnace provided with a tuyerebody having op positely disposed openings to permit a view into theinterior of the furnace, a cap for closing the outer of said openings, afuel feeding tube carried by the cap and extending therethrough towardsthe furnace to supply the same with fuel, and said cap provided with ahole for viewing the discharge of the feed tubes from a point exteriorlyof the furnace and a gate for closing said hol.

4:. In a furnace, the combination of a furnace provided with a tuyerebody having oppositely, disposed openings to permit a view into theinterior of the furnace, a cap for closing the outer of said openings, afuel feeding tube carried by the cap and extending therethro-ugh towardsthe furnace to supply the same with fuel, and said cap provided with ahole for viewing the discharge of the feed tubes from a pointexteriorily of the furnace and a gate for closing said hole and meansfor locking the gate in closed position.

5. In a metallurgical furnace structure, the combination of afurnace, atuyere body opening into the same and. a closing cap for the tuyerebody, said cap provided with means for introducing.substances through hetuyere body and into the furnace and also provided with a poke hole forpermitting access to, or a view of, the furnace at the place where thesubstance isbeing admitted to the furnace.

6. A tuyere body provided with an opening on one side, a cap for closingsaid opening, a feed tube extending through the cap said cap providedwith a poke hole communicating with the opening in the tuyre body.

7. A tuyere body provided with an opening on one side, a cap for closingsaid opening, a feed tube extendingthrough the cap into the interior ofthe tuyere body, said cap provided with a poke hole communicating withthe opening in the tuyere body and a gate for closing the poke hole.

8. A tuyere body provided with oppositely disposed openings one of whichis designed to face and open into the furnace, a cap for provided withan opening extending therethrough and having an arcuate slot partiallyencircling said opening. a face plate contacting with the base plate andhaving an opening aligning with the opening in the base plate andcoacting therewith to receive a feed pipe, a. portion of the face plateoverlapping the arcuate slot to form abayonet slot and a lock nutadapted to hold the feed pipe in place and provided with a lug adaptedto be rotated into locked-position in said bayonet slot.

10. A cap for a tuyere body opening, comprising a base plate providedwith means for securing the same to the tuyere body and provided with anopening extending therethrough and having an arcuate slot partiallyencircling said'opening, .a face plate contacting with the base plateand having an opening aligning with the opening in the base plate andcoacting therewith to receive a feed pipe, a portion of the face plateoverlapping the arcuate slot to form a bayonet slot and a lock nutadapted to hold the feed pipe in place and provided with a lug adaptedtobe rotated into locked position in said bayonet slot, said base and faceplates pro vided with aligned openings forming a poke hole spaced fromthe feed pipe openings.

11. A cap for a tuyere body opening, comprising two plates each having apair of aligned openings extending therethrough, a feed pipe extendingthrough one of the pair of openings and the other pair constituting apoke hole, a gate fitted between the plates to close the poke hole andmeans for demountably securing the plates together.

12. A cap for a tuyere body opening. comprising two plates each having apair of aligned openings extending therethrough, a feed pipe extendingthrough one of the pair of openings and the other pair constituting apoke hole, a gate fitted between the plates to close the poke hole andmeans for demountably securing the plates together. the outer plateprovided with a pin hole and a pin adapted to be inserted into said pinhole to engage the gate and to hold the same in position closing thepoke hole.

13. A cap for a tuyere body opening, comprising two plates each having.a pair of aligned openings extending therethrough, a feed pipeextending through one of the pair of openings and the other pairconstituting apoke hole, a locking nut containing the feed pipe andfitted between the plates and means for securing the plates togetherwith a portion of the lock nut secured therebetween.

14; In a blast furnace, a closing cap provided with two openin sextending therethrough a pipe for feeding fuel to the furnace denountably secured in one of said openings and the other openingconstituting a poke hole permitting access to the interior ofthefurnace,

15. In a blast furnace, a closing cap provided with two openingsextending therethrough a pipe for feeding fuel to the furnacedemountably secured in one of said openings and the other openingconstituting a poke hole permitting access to the interior of thefurnace and a gate demountably cured to the cap to close the poke hole.

16. In a blast furnace, a closing cap provided with an opening extendingtherethrough constituting a poke hole permitting access to the interiorof the furnace and a gate for closing the poke hole.

17. In a blast furnace, a closing cap provided with an opening extendingtherethrough consituting a poke hole permitting access to theintcrior ofthe furnace, a gate for closing the poke hole, said gate being normallvfree to fall by gravity and means for locking the gate in position toclose the poke hole.

18. In a blast furnace, a closing cap provided with an opening extendingtherethrough constituting a poke hole permitting access to the interiorof the furnace, a gate for closing the poke hole, said gate having abevelledside for engaging a similar surface. on the cap and a pin passedthrough the cap and gate for holding the gate in position closing thepoke hole.

19. A closure cap for a tuyere body comprising a base plate having twoownings extending therethrough and a beveled gateway extending from thebottom edge across the lower of the openings, said plate also providedwith a lug receiving recess partially encircling the upper opening, aface plate provided with three openings extending therethrough, two ofsaid openings aligning with the two openings in the base plate to form afeed pipe opening and a poke hole opening through the cap the thirdopening in the face plate being positioned below the base plate a gatefitted in said gateway and a pin in said third hole to hold the gate inplace closing the poke hole.

Qt). A closure cap for a tuyere body comprising a base plate having twoopenings extending therethrough and a beveled gateway extending from thebottom edge across the lower of the openings, said plate also providedwith a lug receiving recess partially encircling the upper opening, aface plate provided with three openings extending therethrough, two ofsaid openings aligning with the two openings in the base plate to form afeed pipe opening and a poke hole opening through the cap, a gate fittedin said gateway and a pin in said third hole to hold the gate in placeclosing the poke hole and a feed pipe holding nut' mounted at the feedpipe opening and provided with a. locking lug engaging in said lugreceiving recess to secure the nut in place.

21. A closure cap for a tuyere body comprising a base plate having twoopenings extending therethrough and a beveled gateway extending from thebottom edge across the lower of the openings, said plate also proridedwith a lug receiving recess partially encircling the upper opening, aface plate providmt with three openings extending therethrough, two ofsaid openings aligning with the two openings in the base plate to form afeed pipe opening and a poke hole opening through the cap, a gate tittedin said gateway and a pin in said third hole to hold the gate in placeclosing the poke hole. a teed pipe holding nut mounted at the feed pipeopening and provided with a locking lug engaging in said lug receivingrecess to secure the nut in place and a two part fuel feeding pipe withan end of each screwed into opposite ends of said holding nut.

22. In a device of the class described the combination of a furnace. atuyere body prorided withan air conduit for supplying air to thefurnace, an ejector positioned ex teriorly of the tuyere body and havinga discharge pipe positioned with its discharge end adjacentthe furnaceand in advance of the air conduit in the tuyerc body thereby to causethe ingoing air from the conduit to have an ejector effect on thesubstance discharged from the 'exteriorly positioned ejector.

523. In a device of the class described the combination of a furnace, atuyere body provided with an air conduit for supplying air to theturnace an ejector positioned extcriorly of the tuyere body and having adischarge pipe positioned with its discharge end adj aceut the furnaceand in advance of the air conduit in the tuyere body thereby to causethe ingoing air from the conduit to have an ejector effect on thesubstance discharged from, the exteriorly positioned ejector, a highpressure air conduit and a pulverized coal conduit leading to saidejector.

Signed at Garfield in the county of Salt Lake and State of Ftah this26th day of February, A. D. 1920.

RICHARD A. VVAGSTAFF.

